Reticulate drum or cylinder of paper making and like machines



Jan. 15, 1935- R, J THOMAS v 1,988,402

RETICULATE DRUM OR CYLINDER OF PAPER MAKING AND LIKE MACHINES Filed June 19, 1933 Patented Jan. 15, 1935 UNITED STATES PATENT OFFICE RETICULATE DRUM OR CYLINDER OF PAPER MAKING AND LIKE MACHINES Application June 19, 1933, Serial No. 676,578 In Great Britain November 14, 1932 1 Claim. (01. 9243) The present invention relates to improvements in drums for paper-making and the like machines of the type in which a hollow drum has a reticulate surface, so that water may pass there- 5 through to be drawn away from the interior leaving a film or webof partly dried or de-Watered material, such as paper pulp on the exterior surface. I

It has been usual to make up these drums and end members connected together by axial tie bars supported at one or more places on internal spiders, the said bars serving to support the wire mesh or the like reticulate surface. As the cylinde-rs are usually of considerable length and 5 diameter, a number of suchbars are necessary spaced about the virtual cylindrical surface of the drum in order to give adequate support for the wire meshwork or the like reticulate, sheet enveloping the cylinder.

It has been found that such constructions have the disadvantage that flow of water is obstructed or impeded along thespace areas of the drum lying opposite these axial tie bars and also to some extent by the radial spiders.

2 With a view to overcoming this objection, ac-

cording to the present invention, the elements supporting the wire mesh cylindrical surface are of pear or streamline section.

The invention is more particularly described with reference to the accompanying drawing in which:

Figure 1 is an elevation partly in section of a papermaking drum according to the present invention.

Figure 2 is a detail view on an enlarged scale corresponding to Figure 1.

Figure 3 is a part end View corresponding to Figure 2.

The cylindrical surface of wire meshwork 1 is carried by a number of peripheral wire rings 2, supported in notches on bars 3 parallel with the axis of the drum, which bars 3 are of pear-shaped section, as shown in Figure 3. secured in the end plates or spiders 4 of the drum.

To support the bars of tapering section at various spaced points along the length of the drum a number of supporting rings or spiders 5 are provided which also may be as shown in Figure 2 of tapering cross-section.

It will consequently be seen that by using axial tie bars and also when desired, the peripheral bars or spiders of pear shape section, the minimum of obstruction is given to the inflow of water from the pulp or the like supported on the reticulate surface carried on said axial bars 3 and peripheral bars'5.

Moreover, this construction has the advantage of making a very rigid skeleton framework for the support of the wire meshwork forming the surface of the cylinder, as the pear shaped section of the axial bars 3 allows a rigid keying-in of these into the spiders 5 and also into the end plates 4 of the drum, thus maintaining the drum in true cylindrical form in use.

I declare that what I claim is:- I r A drum for paper-making machines comprising end plates, internal bars of pear shaped section axially of the drum, a cylindrical reticulate surface supported by the knife edges of said pear shaped bars, and peripheral rings spaced along the drum in planes at right angles to its axis of pear shaped cross section, and having pear shaped notches spaced around the periphery to support and lock therein said pear shaped bars.

REGINALD JAMES THOMAS.

These bars 3 are 5 

